--- traio.c.orig
+++ traio.c
@@ -15,6 +15,7 @@
 #include 	"celltype.h"
 #include	"netsize.h"
 #include	<stdio.h>
+#include	<stdlib.h>
 
 
 #define DEFAULT_TRAN_X_DISP	-HA_STE_RAD